JP3024482B2 - Analog electronic clock and charging method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an analog electronic timepiece, and more particularly to an analog electronic timepiece that generates power using kinetic energy generated by a user's operation and charges a secondary power supply.

[0002]

2. Description of the Related Art In a conventional electronic timepiece, electricity as an energy source for driving the timepiece is supplied from a battery. However, batteries need to be replaced when they run out of energy. For this reason, an electronic wristwatch equipped with a self-winding power generating mechanism that generates electric energy necessary for driving a clock by natural movement of a user's arm has been developed. This type of electronic timepiece has attracted attention from the viewpoint of resource saving and environmental protection because not only does it not require troublesome battery replacement but also does not generate waste such as used batteries.

This electronic timepiece has a generator inside, converts kinetic energy accompanying the operation of the user into electric energy, and outputs a charging voltage from a generating coil. A secondary power supply is charged using the charging voltage, and the charging energy is used as a power supply for a clock circuit.

[0004]

When analog display is performed using the electronic timepiece of this configuration, a motor for moving the analog display hands is arranged in the same watch case as the generator. For this reason, there has been a problem that a malfunction of the hand driving motor occurs due to the magnetic flux generated in the power generation coil of the generator.

That is, in a wristwatch or the like, the generator and the hand driving motor are often arranged adjacent to each other in order to efficiently mount components in a narrow watch case. For this reason, when a relatively large current flows through the power generating coil, there is a problem that a part of the generated magnetic flux becomes a leakage magnetic flux, which may cause a malfunction of the hand driving motor.

[0006] This problem appears remarkably when a bypass circuit is formed between the power generation coil and the secondary power supply in order to prevent the secondary power supply from being overcharged. That is, when the voltage of the secondary power supply exceeds a certain reference level, both ends of the power generation coil are short-circuited by a limiter or the like, and charging of the secondary power supply is stopped. At this time, a large short-circuit current flows through the power generation coil. In this state, when a drive pulse is applied to the drive coil of the hand movement motor,
Leakage of magnetic flux from the generator causes malfunction of the hand-operating motor, making accurate time display impossible.

In particular, an analog electronic timepiece using a crystal oscillator or the like is required to have extremely high accuracy. Therefore, when the above-described operation failure occurs, the commercial value of the quartz electronic timepiece is significantly reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem, and has as its object to prevent a malfunction of a hand driving motor during an overcharge preventing operation of a secondary power supply and to perform an accurate analog display. It is an object of the present invention to provide an analog electronic timepiece and a charging method thereof.

[0009]

In order to achieve the above object, the present invention provides a power generating means for converting kinetic energy associated with a user's operation into electric energy and outputting the electric energy as electric energy for charging from a power generating coil. A secondary power supply that is charged by the charging electric energy, and a bypass circuit of the charging electric energy for the secondary power supply when the voltage of the secondary power supply reaches a predetermined voltage, to prevent an overcharge of the secondary power supply An overcharge prevention means for performing the operation, a clock circuit that operates using the charging energy of the secondary power supply and outputs a motor drive pulse, and a motor drive pulse that is energized to a drive coil, thereby rotating The clock circuit outputs a motor drive pulse including a reverse rotation prevention area of the needle driving rotor in the latter half. Characterized in that it is formed as.

According to a second aspect of the present invention, in the first aspect, the clock circuit detects an overcharge prevention operation of the secondary power supply, and when the overcharge prevention operation is detected, the motor driving pulse In the latter half, the output includes the reverse rotation prevention area.

According to a third aspect of the present invention, in any one of the first and second aspects, the clock circuit is configured such that the reverse rotation prevention area is constituted by intermittent pulses.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the power generation means is rotatably mounted,
A rotating weight that converts kinetic energy generated by a user's operation into rotational motion, and a power generating rotor that is driven to rotate by the rotational motion, and as the charging electric energy from the power generating coil by the rotation of the power generating rotor. And a generator that outputs a charging voltage of

According to a fifth aspect of the present invention, there is provided a power generating means for converting kinetic energy associated with a user's operation into electric energy and outputting the electric energy from a power generating coil as charging electric energy, and a secondary charged by the charging electric energy. When the voltage of the power supply and the voltage of the secondary power supply reach a predetermined voltage,
An overcharge prevention unit for forming a bypass circuit of the charging electric energy for the secondary power supply and performing an overcharge prevention operation of the secondary power supply; and operating using the charging energy of the secondary power supply to output a motor drive pulse. A clock circuit and a motor for driving a hand that rotates a rotor for moving the hand by the motor drive pulse being energized to a drive coil,
During the overcharge prevention operation of the secondary power supply, the voltage level of the motor drive pulse is reduced to be lower than or equal to a return malfunction region of the hand driving motor and is output.

According to a sixth aspect of the present invention, in the fifth aspect, the secondary power supply includes a secondary battery charged by the charging electric energy, a booster circuit for boosting the voltage of the secondary battery, and a booster circuit. An auxiliary battery that is charged with an output voltage of the secondary power supply. Is reduced.

According to a seventh aspect of the present invention, in the fifth aspect, the clock circuit reduces the voltage level of the motor drive pulse to be equal to or less than the return malfunction area during the overcharge prevention operation of the secondary power supply. Features.

According to an eighth aspect of the present invention, there is provided a method of charging a secondary power source serving as a drive power source of a clock circuit for outputting a motor drive pulse to a drive coil of a hand movement motor, wherein a kinetic energy associated with a user's operation is electrically transferred. Converting the energy into energy, outputting charging electric energy from a power generation coil to charge a secondary power supply, and, when a voltage of the secondary power supply reaches a predetermined voltage, a bypass circuit of the charging electric energy for the secondary power supply. Forming a step of preventing overcharging of the secondary power supply, and, when the bypass circuit is formed, outputting the motor drive pulse including the reverse rotation prevention area of the hand driving rotor in the latter half of the motor drive pulse; It is characterized by including.

According to a ninth aspect of the present invention, there is provided a method for charging a secondary power source serving as a drive power source of a clock circuit for outputting a motor drive pulse to a drive coil of a hand driving motor, wherein the kinetic energy associated with the user's operation is converted into electric power. Converting the energy into energy, outputting charging electric energy from a power generation coil to charge a secondary power supply, and, when a voltage of the secondary power supply reaches a predetermined voltage, a bypass circuit of the charging electric energy for the secondary power supply. Forming and preventing overcharging of the secondary power supply, and, when the bypass circuit is formed, lowering and outputting the voltage level of the motor drive pulse to be equal to or less than the return malfunction area of the hand driving motor. And a step.

[0018]

According to the analog electronic timepiece of the first aspect, the kinetic energy generated by the operation of the user is converted into electric energy by the power generation means, and is output from the power generation coil as charging electric energy. Thereby, the secondary power supply is charged.

The clock circuit operates using the charging energy of the secondary power supply and outputs a drive pulse. When the drive pulse is energized to the drive coil, the rotor of the hand movement motor is driven to rotate, and the time is displayed in an analog manner.

When the secondary power supply is charged by the power generation means and the secondary power supply is overcharged, the overcharge prevention means forms a bypass circuit. Thereby, the charging energy output from the power generation coil of the power generation means is 2
It passes through the bypass circuit without charging the next power supply.

At this time, a large current flows through the power generation coil. For this reason, a part of the magnetic flux generated by the power generation coil becomes a leakage magnetic flux, which links with the hand driving motor to cause a malfunction.

The present inventor analyzed the cause of the malfunction in more detail and found the following facts.

FIG. 1 is a characteristic diagram of a hand driving motor used in an analog electronic timepiece. In the figure,
The horizontal axis represents the pulse width of the driving pulse, and the vertical axis represents the voltage.

When the hand driving motor is not affected by the magnetic flux from the power generation coil, the pulse width and voltage level of the driving pulse can be set within the normal operation area 1300 excluding the operation stop area 1000. The motor for hand movement operates normally. Here, the operation stop area 1000 is an area where the energy of the drive pulse of the motor is insufficient and the rotor cannot rotate.

For this reason, the pulse width of the motor drive pulse is set so as to avoid the operation stop region 1000. In addition, the reference voltage level of the drive pulse is also set somewhat large so that the reference voltage level of the drive pulse does not drop to the operation stop region 1000 even if there is some voltage fluctuation.

By setting the driving pulse in this way, the motor for driving the hand can normally be operated reliably.

However, when a large current is supplied to the power generation coil due to the above-described operation of preventing the secondary power supply from being overcharged, a part of the magnetic flux generated at this time becomes a leakage magnetic flux and interlinks with the needle driving motor. . As a result, the hand movement motor has the configuration shown in FIG.
As shown in the figure, the return malfunction area 1100 occurs.
The return malfunction region 1100 is a region in which the energy of the drive pulse is too strong, and the rotor that should have rotated returns to its original position and performs a return malfunction. The end result is the same condition that the rotor does not rotate at all.

In addition, during the overcharge prevention operation, the voltage of the secondary power supply is naturally extremely high, and as a result, the motor drive pulse output from the clock circuit is also affected by the voltage level. Will be higher. As a result, the present inventors have found that the drive pulse is likely to be included in the newly generated return malfunction region 1100, and a malfunction of the motor may occur.

Therefore, in the present invention, a pulse including a reverse rotation prevention area of the hand driving rotor is output in the latter half as the motor drive pulse. Thereby, it is possible to prevent the rotor of the hand driving motor from reversing the rotation direction, passing through the target static stable position, and returning to the original static stable position, and reliably moving the needle driving rotor. It can be driven to rotate.

As described above, according to the present invention, it is possible to prevent a malfunction of the hand driving motor in the overcharge prevention device for the secondary power supply, and to perform an accurate analog display.

Note that, in principle, the motor drive pulse may always be output with the reverse rotation prevention area included, but a problem occurs in terms of power consumption. Therefore, a motor drive pulse which does not normally include the reverse rotation prevention area is output as in the second aspect of the present invention, and the motor including the reverse rotation prevention area is detected when an overcharge prevention operation of the secondary power supply is detected. It is preferable to form the driving pulse.

Further, it is preferable that the reverse rotation prevention area is constituted by an intermittent pulse.
By doing so, the power consumption of the secondary power supply can be further reduced, and if the power consumption is the same,
Since the reverse rotation prevention area can be set long, it is possible to more reliably prevent the return malfunction of the needle driving rotor.

Further, according to the fifth to seventh aspects of the present invention, the voltage level of the driving pulse is reduced to a value lower than the newly generated return malfunction area 1100 and output. As a result, similarly to the first aspect of the present invention, it is possible to prevent a malfunction of the hand driving motor during the overcharge prevention operation of the secondary power supply.

At this time, the control of the voltage level of the motor drive pulse may be performed by a booster circuit as described in claim 6 or by a clock circuit as described in claim 7. .

According to the eighth and ninth aspects of the present invention, the secondary battery of the analog electronic timepiece is charged so as not to cause a malfunction of the hand driving motor during the overcharge prevention operation. A charging method can be obtained.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a detailed description will be given of an example in which the present invention is applied to an analog display type electronic wristwatch.

FIG. 2 shows the configuration of the power generating means 10 and the hand moving mechanism 92 used in the electronic timepiece of the embodiment.

The power generating means 10 includes a semicircular rotary weight 12 rotatably attached to a main plate in a timepiece case, a wheel train mechanism 14 for increasing the rotation of the rotary weight 12, and a wheel train mechanism. And a generator 16 in which a generator rotor 18 is rotationally driven by the generator 14.

When the user wears the electronic timepiece and moves his arm, the rotary weight 12 rotates, and the kinetic energy at that time becomes a rotational motion in the direction of the arrow in the figure. The rotation of the oscillating weight 12 is increased by about 100 times by the train wheel mechanism 14 and transmitted to the power generation rotor 18. The magnetic flux linked to the power generation coil 22 via the power generation stator 20 is changed by the high speed rotation of the power generation rotor 18 composed of the N-pole and S-pole permanent magnets.

When the magnetic flux changes, an AC voltage is output from the power generation coil 22 by electromagnetic induction.
It is rectified by the rectifier diode 30 shown in FIG. 3 and charges the capacitor 40 as a secondary battery. Then, leveled electric energy is supplied from the capacitor 40, and the clock circuit 70 using the quartz 72 is driven.

As shown in FIG. 3, the capacitor 40 is
The booster circuit 44 and the auxiliary capacitor 42 constitute a secondary power supply. Then, when the generator 16 operates, the capacitor 40 is charged. In this embodiment, the capacitor 40 has a large capacity of 0.33 F, and is configured to be charged in a capacitor voltage range of 0.45 to 2.2 V. When the watch cannot be driven because the capacitor voltage is low, the booster circuit 44 converts the capacitor voltage to a high voltage to drive the watch. The voltage-converted power is stored in the auxiliary capacitor 42. Therefore, the driving power supply of the actual timepiece is the auxiliary capacitor 42. In the embodiment, the auxiliary capacitor 42 is formed to have a capacitance of 15 μF, and is charged by the booster circuit 44 so that the output voltage is in the range of 1.1 to 2.2 V.

In order to prevent the capacitor 40 from being overcharged, a limiter circuit 50 functioning as an overcharge prevention means.
Is provided. The limiter circuit 50 includes a switch element 52 for turning on and off the bypass circuit, and turns on the switch element 52 when the charging voltage of the capacitor 40 exceeds a reference value for overcharge detection (2.2 V in the embodiment). Then, a bypass circuit for the capacitor charging circuit is formed. As a result, the charging current 200 that has charged the capacitor 40 as shown in FIG. 4A is changed to a bypass circuit formed by using the limiter circuit 50 as shown in FIG.
10, the overcharging of the capacitor 40 is prevented.

The clock circuit 70 includes an oscillating circuit using a quartz 72 (see FIG. 2) as a vibrating section, a frequency dividing circuit for dividing the oscillation output, and driving every one second based on the frequency dividing output. A driving circuit that outputs a pulse, and outputs the driving pulse toward the motor 80 for hand movement. As a result, a driving pulse 300 having a different polarity as shown in FIG. 6 is supplied to the stepping motor 80 which functions as a hand driving motor every second, as shown in FIG.
6 is rotationally driven each time.

The rotation output of the rotor 86 is transmitted through the three-hand drive train wheel mechanism 90 shown in FIG.
The time is transmitted to the minute hand 106 and the hour hand 108, respectively, and the time is displayed in an analog manner.

As described above, in the analog electronic timepiece employing the self-winding power generation mechanism, the generator 16 and the stepping motor 80 for hand movement are mounted in the timepiece case.
In particular, in today's high-density electronic watches, the generator 1
The step motor 6 and the step motor 80 are often arranged adjacent to each other inside the watch case 2 as shown in FIG. Therefore, the magnetic flux generated by the generator 16 has an adverse effect on the operation of the step motor 80. This adverse effect increases as the magnetic flux generated from the generator 16 increases.

In particular, the switching element 5 of the limiter circuit 50
2 is turned on and the overcharge prevention operation is performed,
When the oscillating weight 12 rotates and the power generating operation is performed, FIG.
As shown in the figure, short-circuit current (bypass current)
Flows. This causes an increase in the amount of magnetic flux generated from the generator 16, and the driving pulse 30
Despite the application of 0, this causes a malfunction such as the rotor 86 not rotating.

The present inventors have studied in detail the mechanism of occurrence of such a malfunction and its countermeasures. The contents will be described below.

FIG. 8 shows the general operation principle of the step motor 80.

When pulses 300 having different polarities are output every second from the clock circuit 70 to the drive coil 82 of the step motor 80 as shown in FIG. 6, the rotor 86 rotates by 180 ° each time, and the wheel 86 rotates. The row mechanism 90 is driven.

For example, as shown in FIG.
When the needle 6 is not moving, that is, when the motor drive pulse is not energized, the magnetic pole of the rotor 86 is stopped at the static stable position 400 shown in FIG. This is the rotor 86
The N and S magnetic poles are intended to go as far as possible from the inner notches 88a and 88b.
Each pole rests at a static stable position 400 that is 90 ° out of phase with respect to the inner notches 88a, 88b.

In this state, when a drive pulse 300 is applied to the drive coil 82 as shown in FIG. 7B, a magnetic field is generated in the coil 82 according to the same principle as the electromagnet, and the magnetic core and the stator 84 are indicated by arrows in the figure. As shown in FIG.
4 have N and S poles. Then, the N of the stator and the N pole of the rotor 86 repel each other, and the S pole of the stator 84 and the S pole of the rotor 86 repel each other.
° rotate. As shown in FIG. 7A, the driving pulse 300 used at this time reduces power consumption.
The minimum pulse width _tw and the voltage level required to reliably rotate the rotor 86 are set.

Then, as shown in FIG.
When the rotor 6 rotates by 180 °, the N and S magnetic poles of the rotor 86 are stopped at the static stable position 400. This is the rotor 8
This is because the force for stopping the rotor by the inner notches 88a and 88b is stronger than the inertial rotation force of No. 6. Here, the N and S poles of the rotor 86 are reversed from the state shown in FIG.

It should be noted that the drive pulse 300 is set to the minimum necessary pulse width as described above. Therefore,
Even if the drive pulse 300 is applied, the rotor 86 may not rotate to the position shown in FIG. 8B for some reason, and a phenomenon that the rotor 86 stops at an intermediate position between FIGS. 8B and 8C may occur. is there. The occurrence of this intermediate stop is caused by the coil 8
2 is detected by the current change. When the intermediate stop is detected, the stabilizing pulse 3 shown by the one-dot chain line in FIG.
10 is output, and the rotor 86 is moved to the next static stable position 400 shown in FIG. The details of this technique are described in JP-B-62-43149.

Next, as shown in FIG. 8D, when drive pulses 300 having different polarities are applied to the drive coil 82, the rotor 86 rotates 180 ° in the direction of the arrow in FIG.
Stop at the static stable position shown in.

In this way, each time a drive pulse is output, the step motor 80 operates to rotate the rotor 86 by 180 °.

At this time, in order to operate the step motor 80 reliably, how to set the motor drive pulse output from the clock circuit becomes a problem.

FIG. 1 shows the operation characteristics of the step motor 80 with respect to the present motor drive pulse. This operating characteristic is a characteristic when the step motor 80 is mounted in a timepiece case.

As described above, when there is no influence of the magnetic flux generated by the power generation coil 22, there is an operation stop region indicated by 1000 in the drawing. Therefore, the motor drive pulse 300
Is set to be included in the normal operation area 1300.

By using the drive pulse 300 set as described above, the step motor 80 can be reliably driven during normal operation.

However, in order to prevent the capacitor 40 from being overcharged, when the limiter circuit 50 operates and the short-circuit current shown in FIG. 4B flows, the amount of magnetic flux generated from the generator 16 increases, and It has also been described above that a malfunction area 1100 is newly returned to 80.

Further, in this overcharged state, the voltage of the capacitor 40 is 2.2 V, so that the voltage of the auxiliary capacitor 42 also rises to 2.2 V in conjunction with this voltage rise, and the output from the clock circuit 70 is output. The voltage level of the driven pulse 300 also increases. As a result, the driving pulse 30
The voltage of 0 also increases, and a situation in which the voltage is included in the return malfunction area 1100 occurs.

As described above, if the motor drive pulse set based on the normal operation is also used during the overcharge prevention operation of the capacitor 40, the motor 86 may return to the rotor 86 and cause a malfunction.

FIGS. 9A to 9E show return malfunctions that occur in the step motor 80. FIG.

As shown in FIG. 9A, when a drive pulse is applied to the drive coil 82, the rotor 86 starts rotating toward the next static stable position 400 in the direction of the arrow in the figure. At this time, the pulse width of the drive pulse 300 is set so that when the rotor 86 is rotating normally, the N-pole and S-pole of the rotor 86 are quickly turned off before and after passing through the inner notches 88a and 88b. Have been. However, during the overcharge prevention operation of the secondary battery, the voltage of the drive pulse 300 increases, so that the rotating force acting on the rotor 86 becomes larger than usual, and the rotor 86 rotates at a faster acceleration than usual. I do. As a result, as shown in FIG. 7B, the N pole and the S pole of the rotor 86 are shifted to the next static stable position 40.
0, the drive pulse is not turned off even if the reverse position is reached, and the N pole of the rotor is the S pole of the stator 84 and the rotor 86
Are reversed while being accelerated toward the target static stable position 400 by the electromagnetic attraction force of the N pole of the stator 84.

When the drive pulse 300 is turned off at the position shown in FIG. 9C, the rotor 86 passes the target static stable position 400 due to its inertia, and as shown in FIG. 9D. The position of the inner notches 88a and 88b is passed, and the position returns to the static stable position 400 before the application of the drive pulse as shown in FIG.

In this way, a return malfunction of the rotor 86 occurs. As a result, the rotor 86 does not rotate at all even when the drive pulse is applied.

In order to prevent such erroneous return operation of the rotor 86, the device of this embodiment performs an overcharge prevention operation for the capacitor 40 from the ON / OFF operation of the switch element 52 as shown in FIG. An overcharge prevention detection circuit 60 for detecting whether or not the battery is present is provided. The detection output of the detection circuit 60 is output to the clock circuit 70.

When the overcharge prevention operation is not performed, the clock circuit 70 has the normal pulse width t shown in FIG.
_When the drive pulse 300 of _W is output and the overcharge prevention operation is detected, as shown in FIG. 7B, the reverse rotation prevention area 3 of the hand driving rotor is provided in the latter half of the original drive pulse area 300a.
It is formed so as to output a drive pulse 300 including 00b.

[0069] Thus, for example, the rotor position shown in FIG. 9 (C), FIG. 7 (A), even at the end t _b of the drive pulse area 300a shown (B), the clock circuit of Embodiment 7
From 0, a pulse in the reverse rotation prevention area 300b is continuously output as shown in FIG. Therefore, as shown in FIG. 9 (F), when the rotor 86 passes the target static stable position 400 due to inertia, the rotor 86 moves between the S and N poles of the stator 84 and the N and S poles of the rotor 86. Even if an electromagnetic attraction force is generated to pull the rotor 86 in the normal rotation direction, and the drive pulse 300 is subsequently turned off, the rotor 86 returns to the target static stable position 400 shown in FIG. Become.

As described above, according to the present embodiment, the second half of the drive pulse 300 is output by including the reverse rotation prevention area 300b of the hand-operating rotor 86.
The return malfunction of the rotor 86 during the zero overcharge prevention operation can be reliably prevented.

As shown in FIG. 7 (B), a motor drive pulse including the reverse rotation prevention area in the latter half is always output regardless of whether the overcharge prevention operation is performed. Good, but this creates problems in terms of power consumption.

On the other hand, as in the present embodiment, a drive pulse 300 as shown in FIG.
FIG. 7 (B) only when the overcharge prevention operation is performed.
The drive pulse 300 including the reverse rotation prevention area 300b as shown in FIG. Thus, power consumption for preventing the return malfunction of the rotor 86 can be saved, and the charging energy of the capacitor 40 can be used efficiently.

In the embodiment shown in FIG. 7B, the case where the motor drive pulse 300 output during the overcharge prevention operation is formed as a continuous pulse waveform has been described as an example. Not limited to this, various pulse configurations can be adopted as needed.

For example, as shown in FIG. 7C, the reverse rotation prevention area 300b of the motor drive pulse 300 can be formed as an intermittent pulse. By doing so, power at the time of pulse output can be further saved, and energy can be effectively used.

Further, an arrangement may be made wherein intermittent pulses are output from the latter half of the normal pulse area 300a to the reverse rotation prevention area 300b.

As described above, in the analog electronic timepiece of this embodiment, when the limiter circuit 50 is not operating, the driving pulse 300 as shown in FIG.
When the limiter circuit 50 operates to perform the overcharge prevention operation of the capacitor 40, the motor drive pulse 300 including the reverse rotation prevention area 300b as shown in FIGS. 7B to 7D is used. Malfunction of the hand movement motor at the time of the overcharge prevention operation of the capacitor 40 is reliably prevented, and accurate time display can be performed.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention.

For example, in the above-described embodiment, the reverse rotation prevention area is set in the latter half of the motor drive pulse to prevent the return malfunction of the rotor. However, the present invention is not limited to this. The output may be reduced to a value below the return malfunction area 1100 shown in FIG. That is, during the overcharge prevention operation, the capacitor 40
As described above, the voltage of the driving pulse rises, and the voltage level of the driving pulse also rises due to this effect. Therefore, during the overcharge prevention operation, the voltage level of the motor drive pulse is reduced and output during the overcharge prevention operation, whereby malfunction of the hand driving motor can be prevented in the same manner as in the above embodiment.

Note that such voltage control is performed, for example, in FIG.
As shown in (5), the detection output of the overcharge prevention operation detection circuit 60 may be input to the booster circuit 44, and the voltage control may be performed by the booster circuit 44. In this case, the booster circuit 44
During the overcharge prevention operation of the capacitor 40, the voltage level of the motor drive pulse 300 is changed to the return malfunction region 1
It is formed so as to output the charging voltage to the auxiliary capacitor 42 by lowering the boosting level so that the value becomes 100 or less.

In addition, the clock circuit 70 itself may be formed so as to adjust the voltage level of the motor drive pulse 300 based on the detection of the overcharge prevention operation detection circuit 60. That is, during the overcharge prevention operation of the secondary power supply,
The clock circuit 70 may be configured so that the voltage level of the motor drive pulse 300 is reduced to a voltage lower than the return region and output.

In the above embodiment, the case where the invention is applied to the wristwatch of the present invention has been described as an example. However, it is needless to say that the present invention is applicable to various other portable watches.

[0082]

As described above, according to the present invention,
In an analog electronic timepiece of a type in which a secondary battery is charged by using kinetic energy generated by a user's operation, a malfunction of a hand driving motor during an overcharge prevention operation of the secondary battery is prevented, and an accurate time is obtained. There is an effect that an analog electronic timepiece capable of performing display and a charging method thereof can be provided.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of operation characteristics of a step motor with respect to a motor drive pulse.

FIG. 2 is an explanatory diagram illustrating a main part of a mechanical configuration of the electronic timepiece according to the embodiment.

FIG. 3 is a circuit diagram of the analog electronic timepiece of the embodiment.

FIG. 4A is a schematic explanatory diagram of a charging operation for a secondary battery, and FIG. 4B is a schematic explanatory diagram of an overcharge protection operation.

FIG. 5 is an explanatory diagram of a positional relationship between a generator and a step motor housed in a watch case of a wristwatch.

FIG. 6 is an explanatory diagram of a motor drive pulse output to a step motor.

FIG. 7 is a detailed explanatory diagram of a motor drive pulse.

FIG. 8 is an explanatory diagram of an operation of a step motor used in the electronic timepiece of the invention.

FIG. 9 is an explanatory diagram of a principle of occurrence of a return malfunction of a step motor and a principle of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 power generation means 12 rotating weight 14 wheel train mechanism 16 generator 22 power generation coil 40 capacitor 42 auxiliary capacitor 44 booster circuit 50 limiter circuit 60 overcharge operation detection circuit 70 clock circuit 80 step motor 82 drive coil

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) G04C 10/00-10/04 G04G 1/00

Claims (5)

(57) [Claims] 1. A power generating means for converting kinetic energy accompanying a user's operation into electric energy and outputting the electric energy from a generating coil as charging electric energy; a secondary power supply charged by the charging electric energy; voltage follows the power supply forms a bypass circuit of the charging electric energy to said secondary power source reaches a predetermined voltage, the overcharge prevention means for preventing the overcharging of the secondary power source, the charging energy of said secondary power source A clock circuit that operates using a motor driving pulse and outputs a motor driving pulse; and a motor for driving a hand that rotates a rotor for driving a hand by energizing the driving coil with the motor driving pulse. An analog electronic device, wherein the second half is formed so as to output a motor drive pulse including a reverse rotation prevention area of the hand driving rotor. Total. 2. The clock circuit according to claim 1, wherein the clock circuit detects an overcharge prevention operation of the secondary power supply, and when the overcharge prevention operation is detected, the reverse rotation is performed in a latter half of the motor drive pulse. An analog electronic timepiece characterized in that the output includes a prevention area. 3. The analog electronic timepiece according to claim 1, wherein the clock circuit comprises the reverse rotation prevention area formed of intermittent pulses. 4. The rotating weight according to claim 1, wherein the power generating means is rotatably mounted and converts a kinetic energy generated by a user's operation into a rotating motion. An analog electronic timepiece, comprising: a generator that includes a power generation rotor that is driven to rotate, and that outputs a charging voltage as charging electrical energy from the power generation coil by rotation of the power generation rotor. 5. A method of charging a secondary power supply serving as a drive power supply of a clock circuit for outputting a motor drive pulse to a drive coil of a hand driving motor, comprising: converting kinetic energy accompanying a user's operation into electric energy; Outputting a charging electric energy from a power generating coil to charge the secondary power supply, and forming a bypass circuit of the charging electric energy for the secondary power supply when a voltage of the secondary power supply reaches a predetermined voltage; A step of preventing overcharging of the secondary power supply; and, when the bypass circuit is formed, a step of including and outputting a reverse rotation prevention area of the needle driving rotor in the latter half of the motor drive pulse. A method for charging an analog electronic watch, characterized by the following.